Re: [RFC/PATCH] Make powerpc64 use __thread for per-cpu variables

Richard Henderson
2006-05-10T15:47:38Z

On Wed, May 10, 2006 at 02:03:59PM +1000, Paul Mackerras wrote:
> With this patch, 64-bit powerpc uses __thread for per-cpu variables.

How do you plan to address the compiler optimizing

__thread int foo;
{
use(foo);
schedule();
use(foo);
}

into

{
int *tmp = &foo; // tls arithmetic here
use(*tmp);
schedule();
use(*tmp);
}

Across the schedule, we may have changed cpus, making the cached
address invalid.

r~